An intravenous therapy system may include a hollow needle comprising a distal end and a proximal end, the distal end comprising a sharp tip for insertion into a vein； an infrared (IR) camera placed within a hollow portion of the hollow needle, including: an IR detector； a first light source to emit a first wavelength of IR light； and a second light source to emit a second wavelength of IR light； a comparator to, upon execution of a processor communicatively coupled to the comparator, compare an amount of reflected light received at the IR detector during activation of the first light and second light and provide an indication of light absorption within a vein.
